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Revenues and Deferred Revenue - Schedule of Disaggregated Revenues (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | ¥ 2,200,841 |  | ¥ 1,982,505 | ¥ 974,678
Less: sales tax and surcharges | (6,939) |  | (8,520) | (4,516)
Total net revenues | 2,193,902 | $ 315,134 | 1,973,985 | 970,162
Subtotal Online Educational Courses |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 2,177,360 |  | 1,975,544 | 968,672
Degree- or Diploma-oriented Post-secondary Courses | Subtotal Online Educational Courses |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 2,021,990 |  | 1,814,178 | 822,832
Professional Certification Preparation and Professional Skills Courses | Subtotal Online Educational Courses |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 155,370 |  | 161,366 | 145,840
Commissions |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 15,381 |  | 6,374 | 4,105
Other Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | ¥ 8,100 |  | ¥ 587 | ¥ 1,901

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